| Answer | Crossword Clue |
|---|---|
| OBOE | It's two octaves above the bassoon |
| fifteenths | An organ stop sounding a register of pipes two octaves (fifteen notes) above the diapason |
| fifteenth | An organ stop sounding a register of pipes two octaves (fifteen notes) above the diapason |
| superoctave | an organ coupler giving an octave higher; an organ stop two octaves above the basic pitch |
| superoctaves | SUPEROCTAVE, an organ coupler giving an octave higher; an organ stop two octaves above the basic pitch |
